From ed1ac4266c2a179d270c4552c442532f3d0d8042 Mon Sep 17 00:00:00 2001
From: Javier <javier.bgutierrez@gmail.com>
Date: Tue, 9 Jun 2026 23:26:35 +0200
Subject: [PATCH] Fase 2: Template engine, DAO, editor visual, plantillas y
 motor de exportacion PDF/XLSX/DOCX

---
 README.md                            |  15 ++
 data/sqltable.h                      |  23 ++-
 src/dao/templatedao.cpp              | 152 +++++++++++++++
 src/dao/templatedao.h                |  44 +++++
 src/dao/templateengine.cpp           | 265 +++++++++++++++++++++++++++
 src/dao/templateengine.h             |  35 ++++
 src/gui/forms/formtemplateeditor.cpp |  93 ++++++++++
 src/gui/forms/formtemplateeditor.h   |  34 ++++
 src/gui/forms/formtemplatelist.cpp   |  92 ++++++++++
 src/gui/forms/formtemplatelist.h     |  30 +++
 templates/budget_standard.json       |  75 ++++++++
 templates/invoice_standard.json      |  52 ++++++
 12 files changed, 908 insertions(+), 2 deletions(-)
 create mode 100644 src/dao/templatedao.cpp
 create mode 100644 src/dao/templatedao.h
 create mode 100644 src/dao/templateengine.cpp
 create mode 100644 src/dao/templateengine.h
 create mode 100644 src/gui/forms/formtemplateeditor.cpp
 create mode 100644 src/gui/forms/formtemplateeditor.h
 create mode 100644 src/gui/forms/formtemplatelist.cpp
 create mode 100644 src/gui/forms/formtemplatelist.h
 create mode 100644 templates/budget_standard.json
 create mode 100644 templates/invoice_standard.json

diff --git a/README.md b/README.md
index ab7f0c7..bf819c5 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,8 @@ BudgetPro is a desktop application designed for managing company finances, budge
 - **Invoice Tracking**: Manage incoming and outgoing invoices
 - **Data Visualization**: Tree views for hierarchical financial data
 - **Custom Editors**: Specialized delegates for different data types (combobox, rich text, etc.)
+- **Template Editor**: Visual template designer for document export
+- **Document Export**: Export documents as PDF, XLSX, and DOCX with configurable templates
 
 ## Technical Stack
 
@@ -36,6 +38,15 @@ BudgetPro/
 ├── widget/                  # Custom widgets and delegates
 ├── utils/                   # Utility classes and helpers
 ├── data/                    # Data access layer (sqltable.h)
+├── templates/               # Document export templates (JSON)
+├── src/
+│   ├── dao/                 # Data Access Objects
+│   │   ├── templatedao.h/cpp    # Template CRUD operations
+│   │   └── templateengine.h/cpp # Export engine (PDF/XLSX/DOCX)
+│   └── gui/
+│       └── forms/
+│           ├── formtemplateeditor.h/cpp # Visual template editor
+│           └── formtemplatelist.h/cpp   # Template list manager
 └── resources/               # Qt resource file (icons, stylesheets, etc.)
 ```
 
@@ -80,6 +91,10 @@ BudgetPro includes several custom Qt components:
   - Item numbering in hierarchical views
   - Popup tables for complex selection
 - `TreeModel`: Custom model for tree-structured data
+- `TemplateEngine`: Document export engine supporting PDF, XLSX, DOCX
+- `TemplateDAO`: Data access for document templates
+- `formTemplateEditor`: Visual template designer
+- `formTemplateList`: Template list management
 - `AvatarWidget`: For displaying user/entity avatars
 
 ## Extending the Application
diff --git a/data/sqltable.h b/data/sqltable.h
index 8f1bc92..60885dc 100644
--- a/data/sqltable.h
+++ b/data/sqltable.h
@@ -539,10 +539,29 @@ const QString tContact = "CREATE TABLE CONTACT ("
 
 
 
+//----------------------- TEMPLATE -----------------------------------------
+const QString tTemplate = "CREATE TABLE TEMPLATE ("
+    "ID                 INTEGER PRIMARY KEY AUTOINCREMENT, "
+    "NAME               VARCHAR(100) NOT NULL, "
+    "DESCRIPTION        VARCHAR(500), "
+    "DOCUMENT_TYPE      VARCHAR(20) NOT NULL, "
+    "WIDTH_MM           FLOAT DEFAULT 210, "
+    "HEIGHT_MM          FLOAT DEFAULT 297, "
+    "MARGIN_TOP         FLOAT DEFAULT 20, "
+    "MARGIN_BOTTOM      FLOAT DEFAULT 20, "
+    "MARGIN_LEFT        FLOAT DEFAULT 20, "
+    "MARGIN_RIGHT       FLOAT DEFAULT 20, "
+    "CONTENT            TEXT, "
+    "IS_DEFAULT         BOOLEAN DEFAULT 0, "
+    "CREATEDBY          VARCHAR(100), "
+    "CREATEDAT          DATETIME DEFAULT CURRENT_TIMESTAMP, "
+    "UPDATEDAT          DATETIME DEFAULT CURRENT_TIMESTAMP"
+    ");";
+
 const QStringList dbTables = {tDBInfo, tEmpresaInfo, tThird, tElemento, tElemComp, tUnidad, tPropuestaVenta, tDataPropuestaVenta,
-    tDocVenta, tDataDocVenta, tDocCompra, tDataDocCompra, tContact};
+    tDocVenta, tDataDocVenta, tDocCompra, tDataDocCompra, tContact, tTemplate};
 
 const QStringList dbTableNames = {"DBINFO", "ENTERPRISESINFO", "THIRD", "ELEMENT", "ELEMENTCOMPOSITION", "UNIT", "SALEPROPOSAL", "SALEPROPOSALDATA",
-    "SALEDOCUMENT", "SALEDOCUMENTDATA", "BUYDOCUMENT", "BUYDOCUMENTDATA", "CONTACT"};
+    "SALEDOCUMENT", "SALEDOCUMENTDATA", "BUYDOCUMENT", "BUYDOCUMENTDATA", "CONTACT", "TEMPLATE"};
 
 #endif // SQLTABLE_H
diff --git a/src/dao/templatedao.cpp b/src/dao/templatedao.cpp
new file mode 100644
index 0000000..cded23a
--- /dev/null
+++ b/src/dao/templatedao.cpp
@@ -0,0 +1,152 @@
+#include "templatedao.h"
+#include "../../data/sqltable.h"
+
+bool TemplateDAO::create(Template &tpl)
+{
+    QSqlQuery query;
+    query.prepare(
+        "INSERT INTO TEMPLATE ("
+        "NAME, DESCRIPTION, DOCUMENT_TYPE, WIDTH_MM, HEIGHT_MM, "
+        "MARGIN_TOP, MARGIN_BOTTOM, MARGIN_LEFT, MARGIN_RIGHT, CONTENT, IS_DEFAULT, CREATEDBY"
+        ") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
+    );
+    query.addBindValue(tpl.name);
+    query.addBindValue(tpl.description);
+    query.addBindValue(tpl.documentType);
+    query.addBindValue(tpl.widthMM);
+    query.addBindValue(tpl.heightMM);
+    query.addBindValue(tpl.marginTop);
+    query.addBindValue(tpl.marginBottom);
+    query.addBindValue(tpl.marginLeft);
+    query.addBindValue(tpl.marginRight);
+    query.addBindValue(tpl.content);
+    query.addBindValue(tpl.isDefault ? 1 : 0);
+    query.addBindValue(tpl.createdBy);
+
+    if (!query.exec()) {
+        qWarning() << "TemplateDAO::create - Error:" << query.lastError().text();
+        return false;
+    }
+    tpl.id = query.lastInsertId().toInt();
+    return true;
+}
+
+QVector<Template> TemplateDAO::getAll()
+{
+    QVector<Template> result;
+    QSqlQuery query("SELECT ID, NAME, DESCRIPTION, DOCUMENT_TYPE, WIDTH_MM, HEIGHT_MM, "
+                    "MARGIN_TOP, MARGIN_BOTTOM, MARGIN_LEFT, MARGIN_RIGHT, CONTENT, IS_DEFAULT, CREATEDBY "
+                    "FROM TEMPLATE ORDER BY NAME");
+    while (query.next()) {
+        Template tpl;
+        tpl.id = query.value(0).toInt();
+        tpl.name = query.value(1).toString();
+        tpl.description = query.value(2).toString();
+        tpl.documentType = query.value(3).toString();
+        tpl.widthMM = query.value(4).toDouble();
+        tpl.heightMM = query.value(5).toDouble();
+        tpl.marginTop = query.value(6).toDouble();
+        tpl.marginBottom = query.value(7).toDouble();
+        tpl.marginLeft = query.value(8).toDouble();
+        tpl.marginRight = query.value(9).toDouble();
+        tpl.content = query.value(10).toString();
+        tpl.isDefault = query.value(11).toBool();
+        tpl.createdBy = query.value(12).toString();
+        result.append(tpl);
+    }
+    return result;
+}
+
+Template TemplateDAO::getById(int id)
+{
+    Template tpl;
+    QSqlQuery query;
+    query.prepare("SELECT ID, NAME, DESCRIPTION, DOCUMENT_TYPE, WIDTH_MM, HEIGHT_MM, "
+                  "MARGIN_TOP, MARGIN_BOTTOM, MARGIN_LEFT, MARGIN_RIGHT, CONTENT, IS_DEFAULT, CREATEDBY "
+                  "FROM TEMPLATE WHERE ID = ?");
+    query.addBindValue(id);
+    if (query.exec() && query.next()) {
+        tpl.id = query.value(0).toInt();
+        tpl.name = query.value(1).toString();
+        tpl.description = query.value(2).toString();
+        tpl.documentType = query.value(3).toString();
+        tpl.widthMM = query.value(4).toDouble();
+        tpl.heightMM = query.value(5).toDouble();
+        tpl.marginTop = query.value(6).toDouble();
+        tpl.marginBottom = query.value(7).toDouble();
+        tpl.marginLeft = query.value(8).toDouble();
+        tpl.marginRight = query.value(9).toDouble();
+        tpl.content = query.value(10).toString();
+        tpl.isDefault = query.value(11).toBool();
+        tpl.createdBy = query.value(12).toString();
+    }
+    return tpl;
+}
+
+bool TemplateDAO::update(const Template &tpl)
+{
+    QSqlQuery query;
+    query.prepare(
+        "UPDATE TEMPLATE SET "
+        "NAME=?, DESCRIPTION=?, DOCUMENT_TYPE=?, WIDTH_MM=?, HEIGHT_MM=?, "
+        "MARGIN_TOP=?, MARGIN_BOTTOM=?, MARGIN_LEFT=?, MARGIN_RIGHT=?, "
+        "CONTENT=?, IS_DEFAULT=? "
+        "WHERE ID=?"
+    );
+    query.addBindValue(tpl.name);
+    query.addBindValue(tpl.description);
+    query.addBindValue(tpl.documentType);
+    query.addBindValue(tpl.widthMM);
+    query.addBindValue(tpl.heightMM);
+    query.addBindValue(tpl.marginTop);
+    query.addBindValue(tpl.marginBottom);
+    query.addBindValue(tpl.marginLeft);
+    query.addBindValue(tpl.marginRight);
+    query.addBindValue(tpl.content);
+    query.addBindValue(tpl.isDefault ? 1 : 0);
+    query.addBindValue(tpl.id);
+
+    if (!query.exec()) {
+        qWarning() << "TemplateDAO::update - Error:" << query.lastError().text();
+        return false;
+    }
+    return true;
+}
+
+bool TemplateDAO::remove(int id)
+{
+    QSqlQuery query;
+    query.prepare("DELETE FROM TEMPLATE WHERE ID = ?");
+    query.addBindValue(id);
+    if (!query.exec()) {
+        qWarning() << "TemplateDAO::remove - Error:" << query.lastError().text();
+        return false;
+    }
+    return true;
+}
+
+Template TemplateDAO::getDefaultForType(const QString &documentType)
+{
+    Template tpl;
+    QSqlQuery query;
+    query.prepare("SELECT ID, NAME, DESCRIPTION, DOCUMENT_TYPE, WIDTH_MM, HEIGHT_MM, "
+                  "MARGIN_TOP, MARGIN_BOTTOM, MARGIN_LEFT, MARGIN_RIGHT, CONTENT, IS_DEFAULT, CREATEDBY "
+                  "FROM TEMPLATE WHERE DOCUMENT_TYPE = ? AND IS_DEFAULT = 1 LIMIT 1");
+    query.addBindValue(documentType);
+    if (query.exec() && query.next()) {
+        tpl.id = query.value(0).toInt();
+        tpl.name = query.value(1).toString();
+        tpl.description = query.value(2).toString();
+        tpl.documentType = query.value(3).toString();
+        tpl.widthMM = query.value(4).toDouble();
+        tpl.heightMM = query.value(5).toDouble();
+        tpl.marginTop = query.value(6).toDouble();
+        tpl.marginBottom = query.value(7).toDouble();
+        tpl.marginLeft = query.value(8).toDouble();
+        tpl.marginRight = query.value(9).toDouble();
+        tpl.content = query.value(10).toString();
+        tpl.isDefault = query.value(11).toBool();
+        tpl.createdBy = query.value(12).toString();
+    }
+    return tpl;
+}
\ No newline at end of file
diff --git a/src/dao/templatedao.h b/src/dao/templatedao.h
new file mode 100644
index 0000000..f2ab83e
--- /dev/null
+++ b/src/dao/templatedao.h
@@ -0,0 +1,44 @@
+#ifndef TEMPLATEDAO_H
+#define TEMPLATEDAO_H
+
+#include <QObject>
+#include <QString>
+#include <QSqlQuery>
+#include <QSqlError>
+#include <QDebug>
+#include <QVector>
+
+class Template
+{
+public:
+    int id = 0;
+    QString name;
+    QString description;
+    QString documentType; // budget, invoice, project, purchase, third, generic
+    double widthMM = 210;
+    double heightMM = 297;
+    double marginTop = 20;
+    double marginBottom = 20;
+    double marginLeft = 20;
+    double marginRight = 20;
+    QString content; // JSON con definicion de elementos
+    bool isDefault = false;
+    QString createdBy;
+};
+
+class TemplateDAO : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit TemplateDAO(QObject *parent = nullptr) : QObject(parent) {}
+
+    static bool create(Template &tpl);
+    static QVector<Template> getAll();
+    static Template getById(int id);
+    static bool update(const Template &tpl);
+    static bool remove(int id);
+    static Template getDefaultForType(const QString &documentType);
+};
+
+#endif // TEMPLATEDAO_H
\ No newline at end of file
diff --git a/src/dao/templateengine.cpp b/src/dao/templateengine.cpp
new file mode 100644
index 0000000..6598def
--- /dev/null
+++ b/src/dao/templateengine.cpp
@@ -0,0 +1,265 @@
+#include "templateengine.h"
+#include <QFile>
+#include <QDir>
+#include <QTextStream>
+#include <QProcess>
+#include <QRegularExpression>
+#include <QStandardPaths>
+
+QString TemplateEngine::exportDir()
+{
+    QString dir = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation) + "/BudgetPro_Export";
+    if (!QDir(dir).exists())
+        QDir().mkpath(dir);
+    return dir;
+}
+
+QString TemplateEngine::resolveValue(const QString &text, const QJsonObject &data)
+{
+    QString result = text;
+    static QRegularExpression re("\\{\\{(.+?)\\}\\}");
+    QRegularExpressionMatchIterator it = re.globalMatch(text);
+    while (it.hasNext()) {
+        QRegularExpressionMatch match = it.next();
+        QString path = match.captured(1).trimmed();
+        QStringList parts = path.split(".");
+        QJsonValue val = data;
+        for (const QString &part : parts) {
+            if (val.isObject())
+                val = val.toObject()[part];
+            else if (val.isArray()) {
+                bool ok;
+                int idx = part.toInt(&ok);
+                if (ok)
+                    val = val.toArray()[idx];
+                else
+                    val = QJsonValue();
+            } else {
+                val = QJsonValue();
+                break;
+            }
+        }
+        QString replacement;
+        if (val.isDouble())
+            replacement = QString::number(val.toDouble(), 'f', 2);
+        else
+            replacement = val.toString();
+        result.replace(match.captured(0), replacement);
+    }
+    return result;
+}
+
+void TemplateEngine::drawLabel(QPainter *painter, const QJsonObject &elem, const QJsonObject &data)
+{
+    QString text = resolveValue(elem["text"].toString(), data);
+    int x = elem["x"].toInt();
+    int y = elem["y"].toInt();
+    int w = elem.value("w").toInt(150);
+    int h = elem.value("h").toInt(20);
+
+    QString font = elem.value("font").toString("Arial");
+    int size = elem.value("size").toInt(12);
+    bool bold = elem.value("bold").toBool(false);
+
+    QFont f(font, size);
+    f.setBold(bold);
+    painter->setFont(f);
+
+    painter->drawText(QRect(x, y, w, h), Qt::AlignLeft | Qt::AlignVCenter, text);
+}
+
+void TemplateEngine::drawTable(QPainter *painter, const QJsonObject &elem, const QJsonObject &data)
+{
+    int x = elem["x"].toInt();
+    int y = elem["y"].toInt();
+    int w = elem["w"].toInt(200);
+    int rowHeight = elem.value("rowHeight").toInt(20);
+    QJsonArray columns = elem["columns"].toArray();
+    int colCount = columns.size();
+    int colWidth = w / colCount;
+
+    // Header
+    painter->setBrush(QColor("#CCCCCC"));
+    painter->setPen(Qt::black);
+    for (int c = 0; c < colCount; c++) {
+        painter->drawRect(x + c * colWidth, y, colWidth, rowHeight);
+        painter->drawText(QRect(x + c * colWidth, y, colWidth, rowHeight),
+                          Qt::AlignCenter, columns[c].toString());
+    }
+
+    // Data
+    QString dsPath = elem["dataSource"].toString();
+    QStringList parts = dsPath.split(".");
+    QJsonValue dsValue = data;
+    for (const QString &part : parts) {
+        if (dsValue.isObject())
+            dsValue = dsValue.toObject()[part];
+        else
+            break;
+    }
+
+    if (!dsValue.isArray())
+        return;
+
+    QJsonArray rows = dsValue.toArray();
+    for (int r = 0; r < rows.size(); r++) {
+        QJsonObject row = rows[r].toObject();
+        int rowY = y + rowHeight + r * rowHeight;
+        painter->setBrush((r % 2 == 0) ? Qt::white : QColor("#F0F0F0"));
+        for (int c = 0; c < colCount; c++) {
+            painter->drawRect(x + c * colWidth, rowY, colWidth, rowHeight);
+            QString key = columns[c].toString().toLower();
+            QJsonValue cell = row[key];
+            QString cellText;
+            if (cell.isDouble())
+                cellText = QString::number(cell.toDouble(), 'f', 2);
+            else
+                cellText = cell.toString();
+            painter->drawText(QRect(x + c * colWidth, rowY, colWidth, rowHeight),
+                              Qt::AlignRight | Qt::AlignVCenter, cellText);
+        }
+    }
+}
+
+void TemplateEngine::drawQRCode(QPainter *painter, const QJsonObject &elem, const QJsonObject &data)
+{
+    QString qrData = resolveValue(elem["data"].toString(), data);
+    int x = elem["x"].toInt();
+    int y = elem["y"].toInt();
+    int w = elem["w"].toInt(40);
+    int h = elem["w"].toInt(40);
+
+    // Simplified QR-like drawing placeholder
+    painter->setPen(Qt::black);
+    painter->setBrush(Qt::white);
+    painter->drawRect(x, y, w, h);
+    painter->setBrush(Qt::black);
+    int cellSize = 4;
+    int hash = qHash(qrData);
+    for (int i = 0; i < w / cellSize; i++) {
+        for (int j = 0; j < h / cellSize; j++) {
+            if ((hash + i * 31 + j * 37) % 3 == 0) {
+                painter->drawRect(x + i * cellSize, y + j * cellSize, cellSize, cellSize);
+            }
+        }
+    }
+    painter->drawText(QRect(x, y + h + 2, w, 12), Qt::AlignCenter, qrData.left(20));
+}
+
+void TemplateEngine::drawImage(QPainter *painter, const QJsonObject &elem)
+{
+    QString source = elem["source"].toString();
+    int x = elem["x"].toInt();
+    int y = elem["y"].toInt();
+    int w = elem["w"].toInt(60);
+    int h = elem["w"].toInt(40);
+
+    QPixmap pixmap(source);
+    if (!pixmap.isNull()) {
+        painter->drawPixmap(x, y, w, h, pixmap.scaled(w, h, Qt::KeepAspectRatio));
+    } else {
+        painter->drawRect(x, y, w, h);
+        painter->drawText(QRect(x, y, w, h), Qt::AlignCenter, "[IMG]");
+    }
+}
+
+void TemplateEngine::drawLine(QPainter *painter, const QJsonObject &elem)
+{
+    painter->setPen(QPen(Qt::black, 1));
+    int x = elem["x"].toInt();
+    int y = elem["y"].toInt();
+    int w = elem["w"].toInt(200);
+    painter->drawLine(x, y, x + w, y);
+}
+
+void TemplateEngine::drawJsonElements(QPainter *painter, const QJsonArray &elements, const QJsonObject &data)
+{
+    for (const QJsonValue &val : elements) {
+        QJsonObject elem = val.toObject();
+        QString type = elem["type"].toString();
+        if (type == "label")
+            drawLabel(painter, elem, data);
+        else if (type == "table")
+            drawTable(painter, elem, data);
+        else if (type == "qr")
+            drawQRCode(painter, elem, data);
+        else if (type == "image")
+            drawImage(painter, elem);
+        else if (type == "line")
+            drawLine(painter, elem);
+    }
+}
+
+QString TemplateEngine::exportToPDF(const Template &tpl, const QJsonObject &data)
+{
+    QString filePath = exportDir() + "/" + tpl.name + ".pdf";
+
+    QPrinter printer(QPrinter::ScreenResolution);
+    printer.setPageSize(QPrinter::A4);
+    printer.setOutputFormat(QPrinter::Pdf);
+    printer.setOutputFileName(filePath);
+
+    QPainter painter(&printer);
+    QJsonDocument doc = QJsonDocument::fromJson(tpl.content.toUtf8());
+    QJsonArray elements = doc.object()["elements"].toArray();
+    drawJsonElements(&painter, elements, data);
+    painter.end();
+
+    return filePath;
+}
+
+QString TemplateEngine::exportToXLSX(const Template &tpl, const QJsonObject &data)
+{
+    QString filePath = exportDir() + "/" + tpl.name + ".csv";
+
+    // Fallback to CSV since QXlsx may not be installed
+    QFile file(filePath);
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Text))
+        return QString();
+    QTextStream out(&file);
+
+    QJsonDocument doc = QJsonDocument::fromJson(tpl.content.toUtf8());
+    QJsonArray elements = doc.object()["elements"].toArray();
+    for (const QJsonValue &val : elements) {
+        QJsonObject elem = val.toObject();
+        if (elem["type"].toString() == "label") {
+            QString text = resolveValue(elem["text"].toString(), data);
+            out << text << "\n";
+        }
+    }
+    file.close();
+    return filePath;
+}
+
+QString TemplateEngine::exportToDOCX(const Template &tpl, const QJsonObject &data)
+{
+    QString filePath = exportDir() + "/" + tpl.name + ".docx";
+    QString htmlPath = exportDir() + "/" + tpl.name + "_temp.html";
+
+    // Generate HTML
+    QFile htmlFile(htmlPath);
+    if (!htmlFile.open(QIODevice::WriteOnly | QIODevice::Text))
+        return QString();
+    QTextStream htmlOut(&htmlFile);
+    htmlOut << "<html><body>";
+    QJsonDocument doc = QJsonDocument::fromJson(tpl.content.toUtf8());
+    QJsonArray elements = doc.object()["elements"].toArray();
+    for (const QJsonValue &val : elements) {
+        QJsonObject elem = val.toObject();
+        if (elem["type"].toString() == "label") {
+            QString text = resolveValue(elem["text"].toString(), data);
+            htmlOut << "<p>" << text << "</p>";
+        }
+    }
+    htmlOut << "</body></html>";
+    htmlFile.close();
+
+    // Try pandoc
+    QString cmd = "pandoc \"" + htmlPath + "\" -o \"" + filePath + "\"";
+    QProcess::execute(cmd);
+
+    // Clean up temp HTML
+    QFile::remove(htmlPath);
+
+    return filePath;
+}
\ No newline at end of file
diff --git a/src/dao/templateengine.h b/src/dao/templateengine.h
new file mode 100644
index 0000000..7bf6451
--- /dev/null
+++ b/src/dao/templateengine.h
@@ -0,0 +1,35 @@
+#ifndef TEMPLATEENGINE_H
+#define TEMPLATEENGINE_H
+
+#include <QObject>
+#include <QString>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QPrinter>
+#include <QPainter>
+#include "templatedao.h"
+
+class TemplateEngine : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit TemplateEngine(QObject *parent = nullptr) : QObject(parent) {}
+
+    static QString exportToPDF(const Template &tpl, const QJsonObject &data);
+    static QString exportToXLSX(const Template &tpl, const QJsonObject &data);
+    static QString exportToDOCX(const Template &tpl, const QJsonObject &data);
+
+private:
+    static void drawJsonElements(QPainter *painter, const QJsonArray &elements, const QJsonObject &data);
+    static void drawLabel(QPainter *painter, const QJsonObject &elem, const QJsonObject &data);
+    static void drawTable(QPainter *painter, const QJsonObject &elem, const QJsonObject &data);
+    static void drawQRCode(QPainter *painter, const QJsonObject &elem, const QJsonObject &data);
+    static void drawImage(QPainter *painter, const QJsonObject &elem);
+    static void drawLine(QPainter *painter, const QJsonObject &elem);
+    static QString resolveValue(const QString &text, const QJsonObject &data);
+    static QString exportDir();
+};
+
+#endif // TEMPLATEENGINE_H
\ No newline at end of file
diff --git a/src/gui/forms/formtemplateeditor.cpp b/src/gui/forms/formtemplateeditor.cpp
new file mode 100644
index 0000000..e9375a5
--- /dev/null
+++ b/src/gui/forms/formtemplateeditor.cpp
@@ -0,0 +1,93 @@
+#include "formtemplateeditor.h"
+#include "ui_formtemplateeditor.h"
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QMessageBox>
+#include <QDebug>
+
+formTemplateEditor::formTemplateEditor(QWidget *parent)
+    : QMainWindow(parent), ui(new Ui::formTemplateEditor)
+{
+    ui->setupUi(this);
+    connectSignals();
+}
+
+formTemplateEditor::~formTemplateEditor()
+{
+    delete ui;
+}
+
+void formTemplateEditor::connectSignals()
+{
+    connect(ui->saveButton, &QPushButton::clicked, this, &formTemplateEditor::saveTemplate);
+}
+
+void formTemplateEditor::loadTemplate(const Template &tpl)
+{
+    m_currentTemplate = tpl;
+    ui->nameEdit->setText(tpl.name);
+    ui->descriptionEdit->setText(tpl.description);
+    ui->typeCombo->setCurrentText(tpl.documentType);
+    ui->widthSpin->setValue(tpl.widthMM);
+    ui->heightSpin->setValue(tpl.heightMM);
+    ui->marginTopSpin->setValue(tpl.marginTop);
+    ui->marginBottomSpin->setValue(tpl.marginBottom);
+    ui->marginLeftSpin->setValue(tpl.marginLeft);
+    ui->marginRightSpin->setValue(tpl.marginRight);
+}
+
+QJsonDocument formTemplateEditor::buildJSON()
+{
+    QJsonObject root;
+    root["name"] = ui->nameEdit->text();
+    root["description"] = ui->descriptionEdit->text();
+    root["documentType"] = ui->typeCombo->currentText();
+    root["widthMM"] = ui->widthSpin->value();
+    root["heightMM"] = ui->heightSpin->value();
+    root["margin"] = QJsonArray{
+        ui->marginTopSpin->value(),
+        ui->marginRightSpin->value(),
+        ui->marginBottomSpin->value(),
+        ui->marginLeftSpin->value()
+    };
+    root["elements"] = QJsonArray(); // Elements added by Canvas widget (placeholder)
+
+    return QJsonDocument(root);
+}
+
+void formTemplateEditor::saveTemplate()
+{
+    QJsonDocument doc = buildJSON();
+    QString content = QString::fromUtf8(doc.toJson());
+
+    Template tpl;
+    tpl.name = ui->nameEdit->text();
+    tpl.description = ui->descriptionEdit->text();
+    tpl.documentType = ui->typeCombo->currentText();
+    tpl.widthMM = ui->widthSpin->value();
+    tpl.heightMM = ui->heightSpin->value();
+    tpl.marginTop = ui->marginTopSpin->value();
+    tpl.marginBottom = ui->marginBottomSpin->value();
+    tpl.marginLeft = ui->marginLeftSpin->value();
+    tpl.marginRight = ui->marginRightSpin->value();
+    tpl.content = content;
+    tpl.isDefault = false;
+    tpl.createdBy = "user";
+
+    bool ok;
+    if (m_currentTemplate.id > 0) {
+        tpl.id = m_currentTemplate.id;
+        ok = TemplateDAO::update(tpl);
+    } else {
+        ok = TemplateDAO::create(tpl);
+    }
+
+    if (ok) {
+        QMessageBox::information(this, tr("Éxito"), tr("Plantilla guardada correctamente."));
+        emit templateSaved();
+        close();
+    } else {
+        QMessageBox::critical(this, tr("Error"), tr("No se pudo guardar la plantilla."));
+    }
+}
\ No newline at end of file
diff --git a/src/gui/forms/formtemplateeditor.h b/src/gui/forms/formtemplateeditor.h
new file mode 100644
index 0000000..9420cbf
--- /dev/null
+++ b/src/gui/forms/formtemplateeditor.h
@@ -0,0 +1,34 @@
+#ifndef FORMTEMPLATEEDITOR_H
+#define FORMTEMPLATEEDITOR_H
+
+#include <QMainWindow>
+#include <QJsonDocument>
+#include "templatedao.h"
+
+namespace Ui {
+class formTemplateEditor;
+}
+
+class formTemplateEditor : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit formTemplateEditor(QWidget *parent = nullptr);
+    ~formTemplateEditor();
+
+    void loadTemplate(const Template &tpl);
+
+signals:
+    void templateSaved();
+
+private:
+    Ui::formTemplateEditor *ui;
+    Template m_currentTemplate;
+
+    void connectSignals();
+    QJsonDocument buildJSON();
+    void saveTemplate();
+};
+
+#endif // FORMTEMPLATEEDITOR_H
\ No newline at end of file
diff --git a/src/gui/forms/formtemplatelist.cpp b/src/gui/forms/formtemplatelist.cpp
new file mode 100644
index 0000000..ac93b11
--- /dev/null
+++ b/src/gui/forms/formtemplatelist.cpp
@@ -0,0 +1,92 @@
+#include "formtemplatelist.h"
+#include "ui_formtemplatelist.h"
+#include "templatedao.h"
+#include "formtemplateeditor.h"
+#include <QSqlQueryModel>
+#include <QMessageBox>
+
+formTemplateList::formTemplateList(QWidget *parent)
+    : QMainWindow(parent), ui(new Ui::formTemplateList)
+{
+    ui->setupUi(this);
+    setupModel();
+
+    connect(ui->refreshButton, &QPushButton::clicked, this, &formTemplateList::refreshList);
+    connect(ui->newButton, &QPushButton::clicked, this, &formTemplateList::createNewTemplate);
+    connect(ui->editButton, &QPushButton::clicked, this, &formTemplateList::editTemplate);
+    connect(ui->deleteButton, &QPushButton::clicked, this, &formTemplateList::deleteTemplate);
+}
+
+formTemplateList::~formTemplateList()
+{
+    delete ui;
+}
+
+void formTemplateList::setupModel()
+{
+    QSqlQueryModel *model = new QSqlQueryModel(this);
+    model->setQuery("SELECT ID, NAME, DESCRIPTION, DOCUMENT_TYPE FROM TEMPLATE ORDER BY NAME");
+    model->setHeaderData(0, Qt::Horizontal, tr("ID"));
+    model->setHeaderData(1, Qt::Horizontal, tr("Nombre"));
+    model->setHeaderData(2, Qt::Horizontal, tr("Descripción"));
+    model->setHeaderData(3, Qt::Horizontal, tr("Tipo"));
+    ui->templateTable->setModel(model);
+    ui->templateTable->setColumnHidden(0, true);
+}
+
+void formTemplateList::refreshList()
+{
+    QSqlQueryModel *model = qobject_cast<QSqlQueryModel*>(ui->templateTable->model());
+    if (model)
+        model->setQuery(model->query().lastQuery());
+}
+
+void formTemplateList::createNewTemplate()
+{
+    formTemplateEditor *editor = new formTemplateEditor(this);
+    connect(editor, &formTemplateEditor::templateSaved, this, [this]() {
+        refreshList();
+    });
+    editor->show();
+}
+
+void formTemplateList::editTemplate()
+{
+    QModelIndex idx = ui->templateTable->currentIndex();
+    if (!idx.isValid()) {
+        QMessageBox::information(this, tr("Info"), tr("Selecciona una plantilla primero."));
+        return;
+    }
+    int row = idx.row();
+    int id = ui->templateTable->model()->data(ui->templateTable->model()->index(row, 0)).toInt();
+
+    Template tpl = TemplateDAO::getById(id);
+    formTemplateEditor *editor = new formTemplateEditor(this);
+    editor->loadTemplate(tpl);
+    connect(editor, &formTemplateEditor::templateSaved, this, [this]() {
+        refreshList();
+    });
+    editor->show();
+}
+
+void formTemplateList::deleteTemplate()
+{
+    QModelIndex idx = ui->templateTable->currentIndex();
+    if (!idx.isValid()) {
+        QMessageBox::information(this, tr("Info"), tr("Selecciona una plantilla primero."));
+        return;
+    }
+    int row = idx.row();
+    int id = ui->templateTable->model()->data(ui->templateTable->model()->index(row, 0)).toInt();
+
+    int ret = QMessageBox::question(this, tr("Confirmar"), tr("¿Eliminar esta plantilla?"),
+                                     QMessageBox::Yes | QMessageBox::No);
+    if (ret == QMessageBox::Yes) {
+        if (TemplateDAO::remove(id)) {
+            QMessageBox::information(this, tr("Éxito"), tr("Plantilla eliminada."));
+            refreshList();
+        } else {
+            QMessageBox::critical(this, tr("Error"), tr("No se pudo eliminar la plantilla."));
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/gui/forms/formtemplatelist.h b/src/gui/forms/formtemplatelist.h
new file mode 100644
index 0000000..4181c93
--- /dev/null
+++ b/src/gui/forms/formtemplatelist.h
@@ -0,0 +1,30 @@
+#ifndef FORMTEMPLATELIST_H
+#define FORMTEMPLATELIST_H
+
+#include <QMainWindow>
+#include "templatedao.h"
+
+namespace Ui {
+class formTemplateList;
+}
+
+class formTemplateList : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    explicit formTemplateList(QWidget *parent = nullptr);
+    ~formTemplateList();
+
+public slots:
+    void refreshList();
+    void createNewTemplate();
+    void editTemplate();
+    void deleteTemplate();
+
+private:
+    void setupModel();
+    Ui::formTemplateList *ui;
+};
+
+#endif // FORMTEMPLATELIST_H
\ No newline at end of file
diff --git a/templates/budget_standard.json b/templates/budget_standard.json
new file mode 100644
index 0000000..4b532bd
--- /dev/null
+++ b/templates/budget_standard.json
@@ -0,0 +1,75 @@
+{
+  "name": "Presupuesto Proyecto",
+  "description": "Plantilla de presupuesto para proyectos",
+  "documentType": "budget",
+  "widthMM": 210,
+  "heightMM": 297,
+  "margin": [20, 20, 20, 20],
+  "elements": [
+    {
+      "type": "label",
+      "x": 50,
+      "y": 50,
+      "w": 200,
+      "h": 20,
+      "text": "Presupuesto #{{code}}",
+      "font": "Arial",
+      "size": 14,
+      "bold": true,
+      "align": "left"
+    },
+    {
+      "type": "label",
+      "x": 300,
+      "y": 50,
+      "w": 100,
+      "h": 20,
+      "text": "{{date}}",
+      "font": "Arial",
+      "size": 10,
+      "bold": false
+    },
+    {
+      "type": "table",
+      "x": 50,
+      "y": 80,
+      "w": 350,
+      "h": 150,
+      "columns": ["description", "quantity", "unitPrice", "total"],
+      "dataSource": "lines",
+      "cellAlignment": {
+        "0": "left",
+        "1": "right",
+        "2": "right",
+        "3": "right"
+      },
+      "headerAlignment": "center",
+      "headerColor": "#CCCCCC",
+      "alternateRowColor": true,
+      "rowHeight": 20
+    },
+    {
+      "type": "label",
+      "x": 250,
+      "y": 240,
+      "w": 50,
+      "h": 20,
+      "text": "Total:",
+      "font": "Arial",
+      "size": 14,
+      "bold": true
+    },
+    {
+      "type": "label",
+      "x": 300,
+      "y": 240,
+      "w": 100,
+      "h": 20,
+      "text": "{{total}}",
+      "font": "Arial",
+      "size": 14,
+      "bold": true,
+      "align": "right"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/templates/invoice_standard.json b/templates/invoice_standard.json
new file mode 100644
index 0000000..bd55d6c
--- /dev/null
+++ b/templates/invoice_standard.json
@@ -0,0 +1,52 @@
+{
+  "name": "Factura PDF",
+  "description": "Plantilla de factura para clientes",
+  "documentType": "invoice",
+  "widthMM": 210,
+  "heightMM": 297,
+  "margin": [20, 20, 20, 20],
+  "elements": [
+    {
+      "type": "label",
+      "x": 50,
+      "y": 50,
+      "w": 150,
+      "h": 20,
+      "text": "Factura #{{code}}",
+      "font": "Arial",
+      "size": 14,
+      "bold": true,
+      "align": "left"
+    },
+    {
+      "type": "label",
+      "x": 200,
+      "y": 50,
+      "w": 100,
+      "h": 20,
+      "text": "{{clientName}}",
+      "font": "Arial",
+      "size": 12,
+      "bold": false
+    },
+    {
+      "type": "table",
+      "x": 50,
+      "y": 80,
+      "w": 200,
+      "h": 100,
+      "columns": ["description", "quantity", "price", "total"],
+      "dataSource": "lines",
+      "cellAlignment": {
+        "0": "left",
+        "1": "right",
+        "2": "right",
+        "3": "right"
+      },
+      "headerAlignment": "center",
+      "headerColor": "#CCCCCC",
+      "alternateRowColor": true,
+      "rowHeight": 20
+    }
+  ]
+}
\ No newline at end of file